Kill him where he stand and stand over him, shake his hand
Then jump back in that mini van, double back to his block and blam I ain't backing down for nothing

from Kendrick Lamar – Ignorance is Bliss Lyrics on Rap Genius

When you challenge Kendrick, he not only will kill you, but go to your block and kill your friends and family too.

By shaking his hand, he’s paying respect to the man he just killed. This is to point out that it’s not personal, just that someone has to die for Kendrick to act out his revenge/defend his homies and assert his manhood.

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